Buffer image layers in chunks in sync upload API

closes: #2081
(cherry picked from commit 2510dd9)

Author: git-hyagi

CHANGES/2081.bugfix

@@ -0,0 +1 @@
+Modified the sync upload API to buffer the image layers in chunks, reducing memory usage.

pulp_container/app/registry_api.py

@@ -92,6 +92,7 @@
 from pulp_container.constants import (
     EMPTY_BLOB,
     MANIFEST_TYPE,
+    MEGABYTE,
     SIGNATURE_API_EXTENSION_VERSION,
     SIGNATURE_HEADER,
     SIGNATURE_PAYLOAD_MAX_SIZE,
@@ -842,7 +843,8 @@ def create_single_chunk_artifact(self, chunk):
         with transaction.atomic():
             # 1 chunk, create artifact right away
             with NamedTemporaryFile("ab") as temp_file:
-                temp_file.write(chunk.read())
+                while subchunk := chunk.read(MEGABYTE):
+                    temp_file.write(subchunk)
                 temp_file.flush()
 
                 uploaded_file = PulpTemporaryUploadedFile.from_file(